格式化日期并按范围过滤

Question

您好，我正在尝试格式化日期

• CSV 格式为dd / mm / yyyy
• 并且需要将 ddmmyyyy 放在 json 中
  • 按范围过滤，例如从01012019 到31012019

谁能给我一个建议？

序列化

static void Main(string[] args)
{
    using (var reader = new StreamReader("../database.csv"))
    using (var csv = new CsvReader(reader, CultureInfo.InvariantCulture))
    {
        csv.Configuration.Delimiter = ",";

        var records = csv.GetRecords<Tabela>().ToList();
        // JSON writing
        var json = JsonConvert.SerializeObject(records);
        File.WriteAllText("../database.json", json);

        System.Console.WriteLine(records);
    }
}

型号

class Tabela
{
    public DateTime date { get; set; }
    public String media { get; set; }
    public String client_id { get; set; }
    public String client_name { get; set; }
    public String campaign_id { get; set; }

    public String campaign_name { get; set; }

    public int clicks { get; set; }
    public int impressions { get; set; }
    public Double investment { get; set; }
}

Answer 1

这应该可行：

        var validFrom = DateTime.TryParseExact("01012019", "ddMMyyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime from);
        var validTo = DateTime.TryParseExact("31012019", "ddMMyyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime to);

        if (validFrom && validTo)
        {

            var records = csv.GetRecords<Tabela>()
                .Where(x => x.date >= from && x.date <= to)
                .Select(x => new {
                    date = $"{x.date:ddMMyyyy}",
                    // ...
                    // the rest of the properties
                    // or selected
                })
                .ToList();
        }

日期如何写入 json 文件的示例：

File.WriteAllText("../../../dates.json", $"{{\n\t\"date\": \"{DateTime.Now:ddMMyyyy}\"\n}}");